Printing-press



4(No Model.)

I G. G. HARRIS. PRINTING PRESS.

Patelgte Mar. 16,1897.

UNITED STATES PATENT OEEICE.

CHARLES G. HARRIS, OF NILES, OHIO.

PRINTING-PRESS.

SPECIFICATION forming part of Letters Patent No. 578,739, datedMarch 16, 1897. Application iiled July 3l, 1894. Serial No. 519,116. (No modeL) T0 @ZZ whom t may concern,.-

Be it known that I, CHARLES G. HARRIS, of Niles, in the county of Trumbull and State of Ohio, have invented certain newand useful Improvements in Printing-Presses; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention contemplates certain new and useful improvements in printing-presses, and has for its object to provide simple and highly-efficient means for effecting the printing on. both sides of a sheet of paper or the like in one feeding thereof between the press rolls or cylinders. This I accomplish by providing the lower roll or cylinder with a springheld shaft carrying holding-pins for engaging one end of a sheet of paper or the like and holding the same while the roll or cylinder is being rotated, the other end of said sheet being free and allowed to fall awayfrom the roll or cylinder and again be brought into contact therewith with its reverse side outward, the said holding-pins being released from engagement with said sheet as the sheet is about to be printed upon 'the second time and instantly engaging the end of a second sheet, which latter is also carried around with the roll or cylinder and reversed during the rotation thereof. tated by a cranked end thereof engaging a curved flange, and its movement under the tension of its spring is limited by the other cranked end thereof engaging a stop.

Afurther object is to construct a printingpress capable of effecting the result stated in which the parts shall be simple and inexpensive, efficient in operation, durable, and not liable to get out of order or be deranged.

The invention will be hereinafter fully described, and particularly pointed out in the claims.

In the accompanying drawings, Figure l is a view in perspective of a portion of a printing-press with parts broken away, showing my improvements. Fig. 2 is a front View thereof. Fig. 3 is a sectional View on the line 3 3, Fig. 2. Fig. 4 is a perspective view of the rock-shaft. Fig. 5 is a detail.

Referring to the drawings, A A designate the two rolls or cylinders, the former being The shaft is partially rodesigned to carry two adjoining sets of types or impression-plates ct, the impression of each of which is to be imparted to a sheet of paper fed over and carried by the lower roll A', the said sheet of paper being held on said lower roll or cylinder, while being printed, by tapes or bands c2, passing overthe upper surface thereof and engaging forward and rearward rollers ots a4, such as is shown in my pending application for Let-ters Patent, filed March '7, 1594, Serial No, 502,738.

Extending longitudinally over the periphery of the lower press roll or cylinder A from end to end thereof is a semicylindrical groove or cut-away portion b, designed to accommodate a rock-shaft B, the ends of which latter are extended beyond the ends of said press roll or cylinder and are supported by rigid arms h', secured to the shaft h2 ofthe roll or cylinder Al or to the ends of the latter, said arms b forming bearings for said rock-shaft B. at angles to ferm crank arms C C. The downward movement of the crank-arm Cis limited by a stop-pin d, extending outwardly from the adjacent supporting-arm b'. A coilspring D encircles shaft B and normally holds the crank-arm C' tight against its stop-pin. Upon this shaft B are fitted two or more holders, one form of which is shown as consisting of hooked pins d, extendingoutwardly from collars d2, which latter are adjustably held on said shaft by set-screws d3. These collars can be easily adjusted according to the posilfion it is desired the holders shall occupy. The journals of the rolls or cylinders are supported in the side uprights d4 of the pressframe, the journal of the roll A fitting in sockets at the lower side of said uprights. To the inner end of one of these uprights is secured a iiange or collar E, which describes a segment of a circle, the upper end thereof terminating at the side of the openingin said upright.

As the lower roll or cylinder A revolves and the crank-arm C of shaft B comes in contact with the lower end of this semicircular iiange or collar E, said shaft makes nearly one-half a revolution, it being turned as against the action of its spring, and is held in this position while said crank-arm remains The extreme ends of this shaft B are bent IOO in engagement with said ange, and when v said arm frees itself from-contact therewith by passing beyond the upper end thereof said shaft B will be instantly turned to' its normalposition under the action of its spring,

its movement being limited by contact of its crank-arm C with the stop-pin in juXtaposition thereto. In this way the paper-holders are thrown back to their normal posit-ion.

In practice just as the crank-arm() of the shaft B frees itself from engagement with the upper ends of the flange E and the hooked pins of the holders carried by said shaft are thrown forward they engage the rear edge of a sheet just acted upon by one of theimpression-plates carried by the upper roll or cylinder A, and said sheet is thus carried along by said pins with said roll or cylinder A' after itis freed from the carrying-tapes a2. The sheet being thus held at the rear end, its front end drops away from the roll or cylinder A', and as the crank-arm C engages the lower end of said semicircular flange and travels along in engagement therewith the previously-printed side of the paper is presented toward the periphery of said roll or cylinder A', and as said crank-arm reaches the upper end of said flange or collar and the lsecured end (now the forward end) of the sheet is then again caught by the carryingtapes, so that the reverse side of the paper will be printed by the type or impressionplate, the rear end of another sheet printed upon by the other impression-plate is engaged by the hooked pins of the shaft B iiying over and engaging therewith under action of the spring of said shaft, this action of said shaft freeing the pins from engagement with the first-mentioned sheet, which is now about to undergo printing on its reverse side, after which it is discharged from the press. The second sheet thus engaged by the hooked pins is carried around with the roll or cylin- The advantages of my invention will be readily understood by those skilled in the art, and it will be specially observed that I have provided simple and highly-eicient means for effecting the printing on both sides of a sheet of paper in one revolution of the paper-carrying roll or cylinder. The mechanism is positive in its operation, is simple, inexpensive, and durable, and not liable to readily get out of order or be deranged.

I claim as my inventionl. In a printing-press having an impression-cylinder, a shaft extended longitudinally over said cylinder and mounted at ,its ends, said ends being cranked, a spring encircling said shaft, holding-pins adjustably mounted on the latter, a ange with which one of the cranked ends of said shaft is designed to engage, and a stop adjacent to the other cranked end of said shaft, substantially as set forth.

2. A printing-press having its impressioncylinder provided with a longitudinal peripheral groove, a spring-held shaft located in said groove, supports for said shaft at the ends of said cylinder, said shaft having cranked ends, holding-pins on said shaft, a curved flange with which one of the cranked ends of said shaft is designed to engage, and astop for limiting the movement of said shaft, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

CHARLES G. HARRIS. lVitnesses:

W. H. SMILEY, Gao. W. UPToN. 

